1.组网需求
所有交换机运行BGP协议,Switch A与Switch B建立EBGP连接,Switch C与Switch B和Switch D之间建立IBGP连接。
Switch C作为路由反射器,Switch B和Switch D为Switch C的客户机。
Switch D能够通过Switch C学到路由20.0.0.0/8。
2.配置步骤
1)配置各接口的IP地址,并在AS 200内配置OSPF
2)配置BGP连接
SWA [SwitchA] bgp 100 [SwitchA-bgp-default] router-id 1.1.1.1 [SwitchA-bgp-default] peer 192.1.1.2 as-number 200 [SwitchA-bgp-default] address-family ipv4 unicast [SwitchA-bgp-default-ipv4] peer 192.1.1.2 enable [SwitchA-bgp-default-ipv4] network 20.0.0.0 # 通告20.0.0.0/8网段路由到BGP路由表中。 SWB [SwitchB] bgp 200 [SwitchB-bgp-default] router-id 2.2.2.2 [SwitchB-bgp-default] peer 192.1.1.1 as-number 100 [SwitchB-bgp-default] peer 193.1.1.1 as-number 200 [SwitchB-bgp-default] address-family ipv4 unicast [SwitchB-bgp-default-ipv4] peer 192.1.1.1 enable [SwitchB-bgp-default-ipv4] peer 193.1.1.1 enable [SwitchB-bgp-default-ipv4] peer 193.1.1.1 next-hop-local SWC [SwitchC] bgp 200 [SwitchC-bgp-default] router-id 3.3.3.3 [SwitchC-bgp-default] peer 193.1.1.2 as-number 200 [SwitchC-bgp-default] peer 194.1.1.2 as-number 200 [SwitchC-bgp-default] address-family ipv4 unicast [SwitchC-bgp-default-ipv4] peer 193.1.1.2 enable [SwitchC-bgp-default-ipv4] peer 194.1.1.2 enable SWD [SwitchD] bgp 200 [SwitchD-bgp-default] router-id 4.4.4.4 [SwitchD-bgp-default] peer 194.1.1.1 as-number 200 [SwitchD-bgp-default] address-family ipv4 unicast [SwitchD-bgp-default-ipv4] peer 194.1.1.1 enable
3)配置路由反射器
SWC [SwitchC] bgp 200 [SwitchC-bgp-default] address-family ipv4 unicast [SwitchC-bgp-default-ipv4] peer 193.1.1.2 reflect-client [SwitchC-bgp-default-ipv4] peer 194.1.1.2 reflect-client
3.验证配置
# 查看Switch B的BGP路由表。 [SwitchB] display bgp routing-table ipv4 Total number of routes: 1 BGP local router ID is 2.2.2.2 Status codes: * - valid, > - best, d - dampened, h - history, s - suppressed, S - stale, i - internal, e - external a – additional-path Origin: i - IGP, e - EGP, ? - incomplete Network NextHop MED LocPrf PrefVal Path/Ogn * >e 20.0.0.0 192.1.1.1 0 0 100i # 查看Switch D的BGP路由表。 [SwitchD] display bgp routing-table ipv4 Total number of routes: 1 BGP local router ID is 4.4.4.4 Status codes: * - valid, > - best, d - dampened, h - history, s - suppressed, S - stale, i - internal, e - external a – additional-path Origin: i - IGP, e - EGP, ? - incomplete Network NextHop MED LocPrf PrefVal Path/Ogn * >i 20.0.0.0 193.1.1.2 0 100 0 100i 可以看出,Switch D从Switch C已经学到了20.0.0.0/8路由。
看看天上,于是我去了满是风雪的地方